source: trunk/third/gtkhtml/src/htmlvspace.c @ 16784

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* This file is part of the KDE libraries

   Copyright (C) 1997 Martin Jones (mjones@kde.org)
   Copyright (C) 1997 Torben Weis (weis@kde.org)
   Copyright (C) 2000 Helix Code, Inc.
   
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.
   
   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.
   
   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.
*/

#include <config.h>
#include "htmlvspace.h"
#include "htmlclueflow.h"
#include "htmlpainter.h"


HTMLVSpaceClass html_vspace_class;
static HTMLObjectClass *parent_class = NULL;


static void
copy (HTMLObject *self,
      HTMLObject *dest)
{
        (* HTML_OBJECT_CLASS (parent_class)->copy) (self, dest);

        HTML_VSPACE (dest)->clear = HTML_VSPACE (self)->clear;
}

static gboolean
calc_size (HTMLObject *self, HTMLPainter *painter, GList **changed_objs)
{
        GtkHTMLFontStyle font_style;
        gint new_ascent, new_descent, new_width;
        gboolean changed;

        if (self->parent != NULL
            && HTML_OBJECT_TYPE (self->parent) == HTML_TYPE_CLUEFLOW)
                font_style = html_clueflow_get_default_font_style
                        (HTML_CLUEFLOW (self->parent));
        else
                font_style = GTK_HTML_FONT_STYLE_SIZE_3;

        new_ascent = html_painter_calc_ascent (painter, font_style, NULL);
        new_descent = html_painter_calc_descent (painter, font_style, NULL);
        new_width = 2 * html_painter_get_pixel_size (painter);

        changed = FALSE;

        if (new_ascent != self->ascent) {
                self->ascent = new_ascent;
                changed = TRUE;
        }

        if (new_descent != self->descent) {
                self->descent = new_descent;
                changed = TRUE;
        }

        if (new_width != self->width) {
                self->width = new_width;
                changed = TRUE;
        }

        return changed;
}


void
html_vspace_type_init (void)
{
        html_vspace_class_init (&html_vspace_class, HTML_TYPE_VSPACE, sizeof (HTMLVSpace));
}

void
html_vspace_class_init (HTMLVSpaceClass *klass,
                        HTMLType type,
                        guint object_size)
{
        HTMLObjectClass *object_class;

        object_class = HTML_OBJECT_CLASS (klass);

        html_object_class_init (object_class, type, object_size);

        object_class->copy = copy;
        object_class->calc_size = calc_size;

        parent_class = &html_object_class;
}

void
html_vspace_init (HTMLVSpace *vspace,
                  HTMLVSpaceClass *klass,
                  HTMLClearType clear)
{
        HTMLObject *object;

        object = HTML_OBJECT (vspace);

        html_object_init (object, HTML_OBJECT_CLASS (klass));
        
        object->width = 1;
        object->flags |= HTML_OBJECT_FLAG_NEWLINE;
        
        vspace->clear = clear;
}

HTMLObject *
html_vspace_new (HTMLClearType clear)
{
        HTMLVSpace *vspace;

        vspace = g_new (HTMLVSpace, 1);
        html_vspace_init (vspace, &html_vspace_class, clear);

        return HTML_OBJECT (vspace);
}